Set of buttons for a mobile computing device



FIG. 1 is a front view of a set of buttons for a mobile computing device;

FIG. 2 is a first isometric view thereof; and,

FIG. 3 is a second isometric view thereof.

The broken lines showing the outline of the mobile computing device are directed to environment and are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a set of buttons for a mobile computing device, as shown and described. 